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(No Model.) 2 Sheets-Sheet 1.

W. K. HENRY. DOOR CHECK. No. 580,085. Patented Apr. 6, 1897 i; a 7? i FI .B C 1 EVE/75m mama FETERS co. wow-urns. wismmarou u c (No Model.) 2SheetsSheet 2. I

w. K. HENRY.

DOOR CHECK.

Patented Apr,,6, 1897.

llllll' l ill l'l'il l -lllll' l llllllll v Inns/76m. wbw %W WEN/55555Urvrrnn STATES PATENT ()FFICE.

WILLIAM K. HENRY, OF NEIV BRITAIN, CONNECTICUT, ASSIGNOR TO THE RUSSELL& ERW'IN MANUFACTURING COMPANY, OF SAME PLACE.

DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No. 580,085, dated April 6,1897.

Application filed July 8, 1895. Serial No. 555,242. (No model.)

To all 707mm it may concern.-

Be it known that 1, WILLIAM K. HENRY,

a citizen of the United States, residing at New Britain, in the countyof Hartford and State of Connecticut, have invented certain new anduseful Improvements in Door-Checks, of which the following is aspecification.

My invention relates to improvements in door-checks; and the objects ofmy improvement are simplicity and economy in construction and generalefliciency and convenience of the article.

In the accompanyin drawings, Figure 1 is a front elevation of my doorcheck, together I 5 with a portion of a door and its casing. Fig.

2 is a plan view ofthe same. Fig. 3 isa central vertical section of thesame on a larger scale, the plane of section extending from front torear, some of the parts being shown in elevation. Fig. 4 is a plan viewof the spring-chamber with its cap and the crankarm removed. Fig. 5 is adetached plan view of the cylinder. Fig. 6 is a horizontal sectionthrough the cylinder and piston on the line w w of Fig. Fig. 7 is adetached plan view of the main portion of the piston, the part bearingthe upper cam-surface being removed. Fig. 8 is a side elevation of thepiston with its internal cam-groove indicated in broken lines. Fig. 9 isa horizontal section of the vent-tube and its regulatingscrew, the samebeing on a still larger scale than the preceding figures. Fig. 10 is acentral longitudinal section, partly in elevation, of the link thatconnects the crank-arm with the casing or door, the scale being the sameas for Fig. 8; and Fig. 11 is a reverse plan view of the inner end ofthe crank-arm.

A designates a spring-chamber provided with bracket-like wings 12 forsecuring the spring-chamber and connected parts in their place upon adoor or its casing. I have shown the machine with the spring-chamber Aattached to the door B. The sides of this spring-chamber are formed by ashort cylinder or tube with both ends alike. Its upper end is closed bythe cap 13, and its lower end is closed by the upper end of theliquid-cylinder C. The spring-chamber is also slotted longitudinally, asat 14:, Fig. 4, to receive the hooked outer end of the spring 15, theinner end of said spring being hooked into a slot or otherwise suitablysecured to the sleeve or tube 16, whose end projects through the centerof the cap 13 and is fitted for the attachment thereto of the crank armor lever 17 in any ordinary manner, as, for example, by having a squaredor angular portion, as shown in Fig. 4. The cap and the cylinder may besecured to the respective ends of the spring-chamber by radial screws24.

The lower end of the liquid-cylinder C is cast solid and the upper endis closed by a screw cap or end 18, said cap being provided with acentral hub 19, within which the crankshaft 20 takes one of itsbearings, the upper part of said shaft taking its bearing within thesleeve or tube 16 of the spring-chamber. The upper or outer side of thiscap 18 may have a squared or slabbed oft hub 40 for the application of awrench in screwing it in. A short projecting port-ion of said shaft issquared or made angular, as at 2l, and above said portion is a centralthreaded stern'22, Fig. 5, for receiving the securing-nut 23.

The hub or inner end of the crank arm or lever 17 has two differentrecesses orsockets, as best shown in the reverse plan view, Fig. 11, thelower one of said sockets fitting the upper end of the sleeve 16, whilethe upper socket fits the angular portion 21 of the crankshaft 20,whereby said crank-shat t and sleeve must of necessity move together tothe extent that they may rotate. The crank-arm 17 is slit from thesockets in its head toward its opposite end for some distance, as at 25,to permit its sides to spring or yield a little, and a transverse screw26 extends across said slit 25 to more firmly bind the head of thecrank-arm on the sleeve 16 and shaft 20. A bracket 41, secured to thecasing E, (or sometimes to the door,-) has one end of a link pivoted toit, the other end of said link being pivoted to the outer end of thecrank-arm 17. I prefer to form this link of a tubular part 42 andthreaded rod 43, screwed into said tubular part and provided with aset-nut 44, whereby said link is extensible and may be locked atwhatever length it may be adjusted to.

The screw-cap or cylinder end 18 may be made liquid-tight by anysuitable packing, as at 27, Fig. 3, and made tight around thecrank-shaft bya stuffing-box 28 and packing 29 or any ordinaryconstruction.

A vent-tube 30, open at its upper end and provided with a side orifice31, is secured in the lower end of the liquid-cylinder and extendsupward to near the middle of the cylinder, as shown. Within thisvent-tube is the vent-regulating screw 33,which is screwed into thelower end of said tube and has a flattened portion 32 opposite theorifice 31, so that by turning said screw the quantity of fluid that canpass said tube may be regulated as desired.

' \Vithin the liquid-cylinder is a hollow piston D, which is heldagainst rotation by a spline 50. The lower end of the piston D fits overthe vent-tube 30, is provided with port-holes 34, and a valve 35, whichslides on pins 36 foropening and closing said port-holes in the ordinarymanner of similar valves. The inner wall of the hollow piston is provided with a cam-groove that extends spirally downward from both sides ofa short horizontal portion or summit 37 toward the upper end of thepiston to another short horizontal portion 38 toward the lower end ofthe piston at about half a revolution from the upper horizontal portion,whereby the groove is a reversible or two-handed groove. The piston maybe cast in one piece and the camgroove milled out, or, if desired, themain part of the piston (shown separately in Fig. 6) may be cast withthe lower surface of the camgroove on it and the upper surface may becast or made of a separate piece 45, secured within the main part, asshown in Figs. 3 and 6. A wing or projection 39 on the crank-shaft 20enters this cam-groove, as shown. The liquid-cylinder should be filledwith liquid.

hen the parts are mounted as shown, opening the door will pull thecrank-arm 17 to turn the shaft 20 in the direction indicated by the dartin Fig. 2, thereby winding up the spring 15 and at the same time movingthe wing or projection 39 from the position shown in Fig. 3 toward therear side to the left, thereby forcing the piston upwardly. The valve 35will fall and let a portion of the liquid flow freely through theport-holes to the lower side of the piston.

If the door is opened far enough, the piston will be raised so far as tobring the wing or projection 39 into the lower horizontal portion ofthecam-groove. Upon releasing the door the force of the spring will beexerted to return the door to its former position and thereby revolvethe crank-shaft in the opposite direction, causing the piston to returnto the bottom of the liquid-cylinder. Upon the return of the piston thevalve 35 will close the port-holes through the piston, and no liquid canpass it, except such as may leak and that which passes through thevent-tube, whereby the piston must return slowly and check the force ofthe spring substantially as in the ordinary manner of checks of the sameclass.

In order to change the check for use on a different-handed door, thecrank-arm is removed, the liquid-cylinder and spring-chamber cap 13removed, so that the spring-chamber and its spring may be inverted, andthe cap and liquid-cylinder are again secured in place. If both ends ofthe sleeve 16 are made angular to fit the head of the crank-arm, thesleeve may be inverted with the spring-chamber and spring, but if onlyone end is made angular then said sleeve should be removed andreinserted with its angular end uppermost. The operation is the same asbefore,only the wing or projection 39 of the crank-shaft 20 passesthrough the otherportion of the camgroove, but no matter which way thecamshaft turns its action is to raise the piston. The short horizontalportion of the camgroove at the upper end of the piston maybe made ofsuch width and height as to let the wing or projection of thecrank-shaft reach it just before the door is closed, so that the springmay act with its full force to close the door as the door reaches thejamb.

I claim as my invention 1. The combination of a cylinder and piston, thespring and sprin g-chamber,the sleet e inside the spring and having anangular end projecting from said spring-chamber, the piston operatingshaft projecting from said sleeve, and the crank-arm having adoublesocketed hub, the interior of which is of an angular form havingone portion thereof fitted to receive the angular end of the sleeve andthe other portion thereof to receive the angular end of the shaft forrotating them together, substantially as described and for the purposespecified.

2. A door-check having a rotating projecting part, a crank-arm havingits head fitted thereto and also slit lengthwise on the body side onlyof said arm, as at 25, and provided with the screw 26 substantially asdescribed and for the purpose specified.

3. In a door-check, the combination of a cylinder, a piston in the formof a hollow cylinder with a closing or bottom wall at one end and areversible cam-groove upon the inner face of its cylindrical wall, a.shaft supported in bearings at one end of said cylinder with its endprojecting into the hollow of said piston and having a projection orwing engaging the cam-groove on the inner face of the cylindrical wallof said piston, substantially as described and for the purposespecified.

\VM. K. HENRY.

lVitn esses:

T. S. BISHOP, M. S. WIARD.

ICC

